upei_roblib_search/src/Plugin/Block/RoblibSearchOtherSourcesBlock.php

<?php

namespace Drupal\roblib_search\Plugin\Block;

use Drupal\Core\Block\BlockBase;

/**
 * Provides a search form.
 *
 * @Block(
 *   id = "roblib_search_other_sources",
 *   admin_label = @Translation("Roblib Search Other Sources"),
 *   category = @Translation("Roblib Search"),
 * )
 */
class RoblibSearchOtherSourcesBlock extends BlockBase {

  /**
   * {@inheritdoc}
   */
  ///roblib_search/
  public function build() {
    $prefix = '/roblib_search/';
    $query = $_SERVER['REQUEST_URI'];
    if (substr($query, 0, strlen($prefix)) == $prefix) {
      $query = substr($query, strlen($prefix));
    }
    return [
      '#theme' => 'roblib_search_other_sources',
      '#query' => $query,
    ];
  }
  
  public function getCacheMaxAge() {
    // don't cache this block
    return 0;
  }

}